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data-mw-revid="974479490"><bdi>Netley999</bdi></a> <span class="mw-usertoollinks">(<a href="/w/index.php?title=User_talk:Netley999&action=edit&redlink=1" class="new mw-usertoollinks-talk" title="User talk:Netley999 (page does not exist)">talk</a> | <a href="/wiki/Special:Contributions/Netley999" class="mw-usertoollinks-contribs" title="Special:Contributions/Netley999">contribs</a>)</span></span> at <span id="mw-revision-date">09:03, 23 August 2020</span><span id="mw-revision-summary"> <span class="comment">(MUSA connectors are nominally 75 ohm impedance.)</span></span>. The present address (URL) is a <a href="/wiki/Help:Permanent_link" title="Help:Permanent link">permanent link</a> to this version.</b></p><div id="revision-info-current-plain" style="display: none;">Revision as of 09:03, 23 August 2020 by <a href="/w/index.php?title=User:Netley999&action=edit&redlink=1" class="new mw-userlink" title="User:Netley999 (page does not exist)" data-mw-revid="974479490"><bdi>Netley999</bdi></a> <span class="mw-usertoollinks">(<a href="/w/index.php?title=User_talk:Netley999&action=edit&redlink=1" class="new mw-usertoollinks-talk" title="User talk:Netley999 (page does not exist)">talk</a> | <a href="/wiki/Special:Contributions/Netley999" class="mw-usertoollinks-contribs" title="Special:Contributions/Netley999">contribs</a>)</span> <span class="comment">(MUSA connectors are nominally 75 ohm impedance.)</span></div></div><div id="mw-revision-nav">(<a href="/w/index.php?title=Musa_connector&diff=prev&oldid=974479490" title="Musa connector">diff</a>) <a href="/w/index.php?title=Musa_connector&direction=prev&oldid=974479490" title="Musa connector">← Previous revision</a> | Latest revision (diff) | Newer revision → (diff)</div></div></div></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Harumphy.Musa.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Harumphy.Musa.jpg/220px-Harumphy.Musa.jpg" decoding="async" width="220" height="119" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Harumphy.Musa.jpg/330px-Harumphy.Musa.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Harumphy.Musa.jpg/440px-Harumphy.Musa.jpg 2x" data-file-width="1227" data-file-height="666" /></a><figcaption>From left to right: assembled cable mounted Musa socket, socket components, two types of panel mounted plug</figcaption></figure> <p>The <b>Musa</b> connector (for Multiple Unit Steerable Array/Antenna) is a type of <a href="/wiki/Coaxial" title="Coaxial">coaxial</a> ("coax") connector, originally developed for the manual switching of radio signals. It has a <a href="/wiki/Characteristic_impedance" title="Characteristic impedance">characteristic impedance</a> of 75 Ω,<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> and was adopted for use in the emerging television broadcast industry. </p> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Musa_connector&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>"Multiple Unit Steerable Antenna" refers to an array of rhombic antennas used for high frequency (3–30 MHz) trans-Atlantic communication, "steerable" by the act of connecting several antennas together via a phasing circuit, thus achieving maximum antenna gain in the required direction.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> The Musa connector was developed by the British Post Office, as a reliable and readily deployed means of achieving the desired configuration. </p><p>Some time after commercial television appeared around 1936, the Musa connector came to be used as a standard video connector; its distinctive feature being that unlike most other types of coaxial connector, it is engaged and disengaged by a straight push-pull action, making it ideal for <a href="/wiki/Patch_bay" class="mw-redirect" title="Patch bay">patch bays</a>. In such professional <a href="/wiki/Telecommunications" title="Telecommunications">telecommunications</a> and <a href="/wiki/Video" title="Video">video</a> applications, the connector performed well until the end of analogue (525 or 625 line) television. </p><p>The Musa connector was designed as to be rugged and reliable, typically using solid <a href="/wiki/Sterling_silver" title="Sterling silver">sterling silver</a> contacts, and turned silver-plated brass or <a href="/wiki/Phosphor_bronze" title="Phosphor bronze">phosphor bronze</a> bodies. In consumer products, much less expensive connectors, such as the <a href="/wiki/Belling-Lee_connector" title="Belling-Lee connector">Belling Lee</a> coax connector, have performed the same function. </p> <div class="mw-heading mw-heading2"><h2 id="Modern_use">Modern use</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Musa_connector&action=edit&section=2" title="Edit section: Modern use"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Use of 75 Ω impedance as the standard for video broadcast equipment may be largely due to the better wideband performance obtainable from 75 Ω than 50 Ω cable of similar physical size, and is generally less expensive. The <a href="/wiki/Coaxial_cable#Choice_of_impedance" title="Coaxial cable">historical choice</a> of 75 Ω has turned out to be advantageous with the latest technology. </p><p>Often, 75 Ω <a href="/wiki/BNC_connector" title="BNC connector">BNC connectors</a> are used, however these are not freely pluggable like MUSA connectors, due to the bayonet locking action, except for specially engineered patch panels which omit the bayonet function, just relying upon the friction of the connector's mating surfaces. </p> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Musa_connector&action=edit&section=3" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text">Ohm is where the art is - Publication: IBE - International Broadcast Engineer; Date: Tuesday, April 1, 2003</span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFFriisFeldman1937" class="citation journal cs1">Friis, H.T.; Feldman, C.B. (1937). "A Multiple Unit Steerable Antenna for Short-Wave Reception". <i>Proceedings of the IRE</i>. <b>25</b> (7). IEEE: 841–917. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1109%2FJRPROC.1937.228354">10.1109/JRPROC.1937.228354</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Proceedings+of+the+IRE&rft.atitle=A+Multiple+Unit+Steerable+Antenna+for+Short-Wave+Reception&rft.volume=25&rft.issue=7&rft.pages=841-917&rft.date=1937&rft_id=info%3Adoi%2F10.1109%2FJRPROC.1937.228354&rft.aulast=Friis&rft.aufirst=H.T.&rft.au=Feldman%2C+C.B.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AMusa+connector" class="Z3988"></span></span> </li> </ol></div> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist 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href="/wiki/Template:RF_connectors" title="Template:RF connectors"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:RF_connectors" title="Template talk:RF connectors"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:RF_connectors" title="Special:EditPage/Template:RF connectors"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="RF_connectors_(coaxial)" style="font-size:114%;margin:0 4em"><a href="/wiki/RF_connector" title="RF connector">RF connectors</a> (<a href="/wiki/Coaxial_cable" title="Coaxial cable">coaxial</a>)</div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/7/16_DIN_connector" title="7/16 DIN connector">7/16 DIN</a></li> <li><a href="/wiki/APC-7_connector" title="APC-7 connector">APC-7</a></li> <li><a href="/wiki/BNC_connector" title="BNC connector">BNC</a></li> <li><a href="/wiki/Belling-Lee_connector" title="Belling-Lee connector">Belling-Lee connector</a></li> <li><a href="/wiki/C_connector" title="C connector">C</a></li> <li><a href="/wiki/F_connector" title="F connector">F-type</a></li> <li><a href="/wiki/FME_connector" title="FME connector">FME</a></li> <li><a href="/wiki/Hirose_U.FL" title="Hirose U.FL">Hirose U.FL</a></li> <li><a href="/wiki/Hirose_W.FL" class="mw-redirect" title="Hirose W.FL">Hirose W.FL</a></li> <li><a href="/wiki/Hirose_U.FL" title="Hirose U.FL">IPX</a></li> <li><a href="/wiki/Motorola_connector" title="Motorola connector">Motorola</a></li> <li><a href="/wiki/MCX_connector" title="MCX connector">MCX</a></li> <li><a href="/wiki/Microdot_connector" title="Microdot connector">Microdot</a></li> <li><a href="/wiki/MMCX_connector" title="MMCX connector">MMCX</a></li> <li><a href="/wiki/N_connector" title="N connector">N</a></li> <li><a href="/wiki/QLS_connector" title="QLS connector">QLS</a></li> <li><a href="/wiki/QMA_and_QN_connector" title="QMA and QN connector">QMA/QN</a></li> <li><a href="/wiki/RCA_connector" title="RCA connector">RCA</a></li> <li><a href="/wiki/MHV_connector" title="MHV connector">MHV</a></li> <li><a href="/wiki/SHV_connector" title="SHV connector">SHV</a></li> <li><a href="/wiki/SMA_connector" title="SMA connector">SMA</a></li> <li><a href="/wiki/SMB_connector" title="SMB connector">SMB</a></li> <li><a href="/wiki/SMC_connector" title="SMC connector">SMC</a></li> <li><a href="/wiki/TNC_connector" title="TNC connector">TNC</a></li> <li><a href="/wiki/TV_aerial_plug" title="TV aerial plug">TV aerial plug</a></li> <li><a href="/wiki/UHF_connector" title="UHF connector">UHF</a> / <a href="/wiki/Miniature_UHF_connector" title="Miniature UHF connector">Mini-UHF</a></li></ul> </div></td></tr><tr><td colspan="2" class="navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <dl><dt>Variations and alternate names</dt> <dd></dd> <dd><a href="/wiki/Microdot_connector" title="Microdot connector">10-32</a></dd> <dd><a href="/wiki/SMA_connector#Variations" title="SMA connector">2.9 mm</a> (SMA)</dd> <dd><a href="/wiki/APC-7_connector#Other_names" title="APC-7 connector">7 mm</a></dd> <dd><a href="/wiki/Hirose_U.FL" title="Hirose U.FL">AMC</a> (UFL)</dd> <dd><a href="/wiki/Hirose_U.FL" title="Hirose U.FL">IPEX</a></dd> <dd><a href="/wiki/Hirose_U.FL" title="Hirose U.FL">MHF</a></dd> <dd><a href="/wiki/SMA_connector#Reverse_polarity" title="SMA connector">RP-SMA</a></dd> <dd><a href="/wiki/TNC_connector" title="TNC connector">RP-TNC</a></dd> <dd><a href="/wiki/N_connector" title="N connector">SnapN</a></dd> <dd><a href="/wiki/BNC_connector#Similar_connectors" title="BNC connector">Triax</a> / <a href="/wiki/BNC_connector#Similar_connectors" title="BNC connector">Triaxial</a></dd> <dd><a href="/wiki/BNC_connector#Similar_connectors" title="BNC connector">Twin BNC</a> / <a href="/wiki/BNC_connector#Similar_connectors" title="BNC connector">Twinax</a> (BNC)</dd></dl> </div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <dl><dt>Old or seldom used</dt> <dd><a href="/wiki/EIA_RF_Connectors" title="EIA RF Connectors">EIA</a></dd> <dd><a href="/wiki/GR_connector" title="GR connector">GR</a></dd> <dd><a href="/wiki/LEMO" title="LEMO">LEMO 00</a></dd> <dd><a class="mw-selflink selflink">Musa</a></dd></dl> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <dl><dt>See also</dt> <dd></dd> <dd><a href="/wiki/Audio_and_video_interfaces_and_connectors" title="Audio and video interfaces and connectors">Audio and video interfaces and connectors</a></dd> <dd><a href="/wiki/Radio_frequency" title="Radio frequency">Radio frequency</a></dd> <dd><a href="/wiki/Radio_spectrum" title="Radio spectrum">Radio spectrum</a></dd></dl> </div></td></tr></tbody></table></div>    </div><noscript><img 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